Ezee Posted June 16, 2018 Share Posted June 16, 2018 If I press brake pedal fast on 2018 gu 713 l hear burping sound coming from air tanks. Any ideas? Quote Link to comment https://www.bigmacktrucks.com/topic/53578-brake-pedal-sound/ Share on other sites More sharing options...
Dirtymilkman Posted June 16, 2018 Share Posted June 16, 2018 My Titan and cl will to that from time to time too. More when it's hot outside. Quote Link to comment https://www.bigmacktrucks.com/topic/53578-brake-pedal-sound/#findComment-400656 Share on other sites More sharing options...
glitchwrks Posted June 17, 2018 Share Posted June 17, 2018 The Chevrolet C65 log truck will do that sometimes, we've determined it's the double check valve on that particular system. Same if you hook up a hose and use an air tool off of it. Quote Link to comment https://www.bigmacktrucks.com/topic/53578-brake-pedal-sound/#findComment-400665 Share on other sites More sharing options...
blackdog2 Posted June 17, 2018 Share Posted June 17, 2018 My superliner does it first 2-3 miles but gives warning in colder weather . Quote Ed Link to comment https://www.bigmacktrucks.com/topic/53578-brake-pedal-sound/#findComment-400672 Share on other sites More sharing options...
Mackpro Posted June 19, 2018 Share Posted June 19, 2018 There is a bulletin on this . Seems to only happen on the GU's even though it's the exact same set upon the cxu/chu. It's kinda a burping noise at the foot valve that vibrates the brake pedal in most cases. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/53578-brake-pedal-sound/#findComment-400830 Share on other sites More sharing options...
mackcat12 Posted June 30, 2018 Share Posted June 30, 2018 Mackpro what is the fix for this my 2018 granite is doing this too Quote Link to comment https://www.bigmacktrucks.com/topic/53578-brake-pedal-sound/#findComment-401622 Share on other sites More sharing options...
Mackpro Posted July 1, 2018 Share Posted July 1, 2018 The foot valve is not centered in the mounting bracket . When you push down on the brake pedal , the pedal hits the plunger which presses on the foot valve. When the foot valve is not centered the plunger pushes down more on one side than the other of the foot valve and a small amount of air shoots past the seals into the cab Quote Link to comment https://www.bigmacktrucks.com/topic/53578-brake-pedal-sound/#findComment-401718 Share on other sites More sharing options...
mackcat12 Posted July 1, 2018 Share Posted July 1, 2018 Thanks Mackpro is Mack going to fix this or is this a case of the squeaky wheel gets the grease Quote Link to comment https://www.bigmacktrucks.com/topic/53578-brake-pedal-sound/#findComment-401719 Share on other sites More sharing options...
Dirtymilkman Posted July 2, 2018 Share Posted July 2, 2018 They did mine Quote Link to comment https://www.bigmacktrucks.com/topic/53578-brake-pedal-sound/#findComment-401720 Share on other sites More sharing options...
Mackpro Posted July 3, 2018 Share Posted July 3, 2018 On 7/1/2018 at 6:51 PM, mackcat12 said: Thanks Mackpro is Mack going to fix this or is this a case of the squeaky wheel gets the grease One year warranty on this issue. There's really not a official bulletin on this but I have some unofficial info from the higher ups that I can send you and explains it better. Message me for contact info and I can send it to you. Quote Link to comment https://www.bigmacktrucks.com/topic/53578-brake-pedal-sound/#findComment-401787 Share on other sites More sharing options...
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